Above 2 lines will change the handcursor once your cursor is in the rectangle as assigned by thecreate_annotation command. Once you click in that area, it willbring you to the url in create_action command.

I just want to point out that PDF_create_action does not work for URLs with GET parameters (has problems with '='). Running urlencode will just create a URL that is not translated properly by the browser (at least for Firefox 2.0.0.11).

Believe it or not, your best bet is to use pdf_add_weblink(), which is supposedly deprecated.